General Information Marine Eels can be distinguished by their characteristic elongate shape, tail that tapers to a point, and an absence of pelvic (pectoral) fins. They are carnivorous bottom-dwellers that typically have sharp, fang-like teeth. Although there are a few families of Eels available to aquarists, splendidly-marked tropical Moray Eels represent the vast majority of marine eels seen in the hobby. Morays originate from rock and reef areas around the world where they hide among caves and crevices during the day and emerge at nighttime to feed on small fishes and invertebrates (i.e., squid, octopus, mussels, clams, and even sea urchins). Though most have relatively poor eyesight, Morays have an extremely acute sense of smell that they use to detect food.